Drive system for power switching elements

a technology of power switching elements and drive systems, which is applied in the direction of dynamo-electric converter control, pulse techniques, instruments, etc., can solve the problems of increasing the electric power loss generated by changing the switching speed of the switching element, and achieve the effect of reducing the total number of components of the drive system and smoothing the current flow

Active Publication Date: 2011-01-20
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0024]By the way, the drive system according to the present invention controls the switching speed of each of a plurality of the power switching elements. In the drive system, the transformer is composed of a plurality of the primary side coils and a plurality of the secondary side coils. In this circuit configuration of the drive system, each of the secondary side coils is equipped with a choke coil in order to smooth the current flowing in the secondary side coil of the transformer when the transformer is the forward type converter.
[0025]On the other hand, when the transformer is the flyback type converter, it is possible to smooth the current flowing in the secondary side coil by using the primary side coil. This makes it possible to decrease the total number of the components which form the drive system.

Problems solved by technology

Decreasing the switching speed of the switching element suppresses generation of surge noise, but increases electric power loss generated on changing the switching speed of the switching element.

Method used

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  • Drive system for power switching elements

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Experimental program
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first embodiment

[0047]A description will be given of a drive system for changing the switching speed of power switching elements with reference to FIG. 1, FIG. 2, and FIG. 3A to FIG. 3D. For example, the drive system according to the first embodiment is mounted to various types of vehicles such as a hybrid vehicle, with reference to drawings.

[0048]A hybrid vehicle is a vehicle that uses two or more distinct power sources to move the vehicle, for example, hybrid electric vehicles (HEVs) which combine an internal combustion engine and one or more electric rotary machines such as a motor generator and an electric motor. FIG. 1 is a view showing a schematic configuration of the drive system having a plurality of the drive units DU according to the first embodiment.

[0049]As shown in FIG. 1, the drive system is comprised of a transformer 10, a low voltage system, and a high voltage system. The transformer 10 serves as an insulation means with which the low voltage system and the high voltage system are i...

second embodiment

[0084]A description will be given of the drive system for power switching elements according to the second embodiment of the present invention with reference to FIG. 4.

[0085]FIG. 4 is a view showing a circuit configuration of the drive unit DU in the drive system according to the second embodiment of the present invention. In the drive unit DU shown in FIG. 4, the same components in the drive unit DU of the first embodiment shown in FIG. 1 and FIG. 2 will be referred with the same reference numbers.

[0086]In the drive unit DU shown in FIG. 4, a switching speed change part 60-1 to change the switching speed of the power switching element Sw is composed of a gate capacitance change means.

[0087]As shown in FIG. 4, the gate capacitance change means (which serves as the switching speed change part 60-1) is composed of a capacitance 63, a switching element 64, and a capacitance 65. The capacitance 63 is connected in parallel to the switching element 64 and a capacitance 65. The switching e...

third embodiment

[0090]A description will be given of the drive unit DU for power switching elements in the drive system according to the third embodiment with reference to FIG. 5.

[0091]In the drive unit DU in the drive system according to the third embodiment, the switching means to change the switching speed of the power switching element Sw is composed of a gate voltage change means.

[0092]FIG. 5 is a view showing a circuit configuration of the drive unit DU in the drive system according to the third embodiment. In the drive unit DU shown in FIG. 5, the same components in the drive unit DU shown in FIG. 2 will be referred with the same reference numbers.

[0093]As shown in FIG. 5, the gate voltage change means is composed of a regulator 52a which is capable of changing the output voltage of the transformer 10. The regulator 52a changes the output voltage of the transformer 10 based on a difference between the output voltage of the transformer 10 and a threshold voltage value. Because the charging sp...

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Abstract

A drive system has a low voltage system, a high voltage system, and a transformer. The high voltage system has drive units which correspond to power switching elements. A capacitance in the high voltage system serves as a flouting power source which supplies electric power to each of the drive units. An output voltage of a secondary side coil of the transformer is supplied to the capacitance. A comparator compares the output voltage at the secondary side coil of the transformer with a threshold value. A switching speed change part changes the switching speed of each of the power switching element based on the comparison result of the comparator.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is related to and claims priority from Japanese Patent Application No. 2009-169633 filed on Jul. 20, 2009, the contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a drive system for changing the switching speed of power switching elements.[0004]2. Description of the Related Art[0005]There is a conventional technique to change the switching speed of the power switching elements which form an inverter electrically connected to an on-vehicle device such as a motor generator mounted to a vehicle. For example, Japanese patent publication No. 3052792 discloses such a conventional technique to change the switching speed of a switching element in an inverter based on an input voltage supplied to the inverter. Decreasing the switching speed of the switching element suppresses generation of surge noise, but increases electric power lo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02P5/00H02M3/335H02M1/08H02M7/5387
CPCH02M1/08H02M3/335H03K17/0828H03K2017/0806H03K17/605H03K17/691H03K17/14
Inventor INAMURA, HIROSHIMAEBARA, TSUNEOFUKUTA, JUNICHI
Owner DENSO CORP
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